Shien's Dojo is a Continuous Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Shien's Dojo is Unlimited.
YGOPRODeck lists Shien's Dojo for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
Shien's Dojo belongs to the Six Samurai archetype—use that tag when searching for engine pieces and tech options.
A listed print of Shien's Dojo appears in Extreme Victory (EXVC-EN057) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Shien's Dojo is about $0.07 on Cardmarket (prices change frequently).
